AMMONIA 3 (IMAGE) Rice University Caption Postdoctoral fellow Zhen-Yu Wu, left, and graduate student Feng-Yang Chen set up an experiment at their Rice University laboratory to extract ammonia and solid ammonia -- aka fertilizer -- from a wastewater model with low levels of nitrate. Credit Jeff Fitlow/Rice University Usage Restrictions NONE License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.